Journal Article

Pregabalin Induces Hepatic Hypoxia and Increases EndothelialCell Proliferation in Mice, a Process Inhibited by DietaryVitamin E Supplementation

Kay A. Criswell, Jon C. Cook, Dennis Morse, Michael Lawton, Christopher Somps, Leslie Obert, Marc Roy, Sharon Sokolowski, Petra Koza-Taylor, Jennifer Colangelo, Kimberly Navetta, Joseph Brady, David Pegg, 
Zbigniew Wojcinski, Ramin Rahbari, Steven Duddy and Timothy Anderson

in Toxicological Sciences

Volume 128, issue 1, pages 42-56
Published in print July 2012 | ISSN: 1096-6080
Published online April 2012 | e-ISSN: 1096-0929 | DOI: https://dx.doi.org/10.1093/toxsci/kfs148
Pregabalin Induces Hepatic Hypoxia and Increases EndothelialCell Proliferation in Mice, a Process Inhibited by DietaryVitamin E Supplementation

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The preceding article identified key components of pregabalin’s mode of action on nongenotoxic hemangiosarcoma formation in mice, including increased serum bicarbonate leading to decreased respiratory rate, increased blood pH, increased venous oxygen saturation, increased vascular endothelial growth factor and basic fibroblast growth factor expression, increased hepatic vascular endothelial growth factor receptor 2 expression, and increased iron-laden macrophages. Increased platelet count and platelet activation were early, species-specific biomarkers in mice. Dysregulated erythropoiesis, macrophage activation, and elevations of tissue growth factors were consistent with the unified mode of action for nongenotoxic hemangiosarcoma recently proposed at an international hemangiosarcoma workshop (Cohen, S. M., Storer, R. D., Criswell, K. A., Doerrer, N. G., Dellarco, V. L., Pegg, D. G., Wojcinski, Z. W., Malarkey, D. E., Jacobs, A. C., Klaunig, J. E., et al. (2009). Hemangiosarcoma in rodents: Mode-of-action evaluation and human relevance. Toxicol. Sci. 111, 4–18). In this article, we present evidence that pregabalin induces hypoxia and increases endothelial cell (EC) proliferation in a species-specific manner. Dietary administration of pregabalin produced a significant 35% increase in an immunohistochemical stain for hypoxia (Hypoxyprobe) in livers from pregabalin-treated mice. Increased Hypoxyprobe staining was not observed in the liver, bone marrow, or spleen of rats, supporting the hypothesis that pregabalin produces local tissue hypoxia in a species-specific manner. Transcriptional analysis supports that rats, unlike mice, adapt to pregabalin-induced hypoxia. Using a dual-label method, increased EC proliferation was observed as early as 2 weeks in mouse liver and 12 weeks in bone marrow following pregabalin administration. These same assays showed decreased EC proliferation in hepatic ECs of rats, further supporting species specificity. Dietary supplementation with vitamin E, which is known to have antioxidant and antiangiogenic activity, inhibited pregabalin-induced increases in mouse hepatic EC proliferation, providing confirmatory evidence for the proposed mode of action and its species-specific response.

Keywords: pregabalin;; hypoxia;; endothelial proliferation;; Hif1α

Journal Article.  11549 words.  Illustrated.

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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